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研究报告

陈晗炜,张光旭,许文晋,张国孟,邓军.D201树脂负载[Fe(Ⅱ)EDTA]^2-脱除NO过程研究[J].环境科学学报,2017,37(12):4541-4548

摘要：通过D201（Cl型）树脂的离子交换作用，将[Fe（Ⅱ）EDTA]^2-嫁接到树脂骨架上，并以此研究该树脂对NO的吸收过程和脱除效果.主要考察了D201（Cl型）树脂嫁接[Fe（Ⅱ）EDTA]^2-过程中[Fe（Ⅱ）EDTA]^2-负载量、EDTA与Fe²⁺物质的量比、络合液pH、抗氧化剂复配体系等因素对改性树脂脱除NO的影响.结果表明，D201（Cl型）树脂负载[Fe（Ⅱ）EDTA]^2-能够有效地脱除NO，树脂表面残留的络合液在脱除NO过程中起到关键作用，它为NO进入树脂内部反应提供了通道；NO脱除效果随着[Fe（Ⅱ）EDTA]^2-负载量的增加而提高，70 g树脂饱和负载量为12.5~15.0 mmol；当络合液EDTA与Fe²⁺的物质的量比为1.5、pH=6时，得到的负载[Fe（Ⅱ）EDTA]^2-树脂脱除NO的效果最好；烟气中的氧气对NO脱除效果影响极大，加入0.02 mol·L^-1抗坏血酸的复配体系能够较好地减缓氧气的影响；红外分析结果证明，[Fe（Ⅱ）EDTA]^2-和SO₄^2-一起参与了树脂离子交换过程；BET分析表明，D201树脂负载前后孔结构没有变化，树脂的大孔结构提供了较大的NO吸收接触面积.

Abstract：[Fe(Ⅱ)EDTA]^2- ions were grafted on D201 (Cl type) resin matrix by ion exchange to investigate effects of resin on NO removal. The influences of loading amount of[Fe(Ⅱ)EDTA]^2-, molar ratio of EDTA to Fe²⁺, pH of complex solution and antioxygen on absorption of NO with the modified resin were investigated. The results show that D201 resin loaded[Fe(Ⅱ)EDTA]^2- could effectively remove NO, and the Fe(Ⅱ) EDTA residual solution on the surface of resin provided channels for absorption of NO. Denitration capacity of the modified resin increased significantly with the increasing amount of[Fe(Ⅱ)EDTA]^2-,modified resin had the best effect of removing NO when the EDTA:Fe²⁺=1.5 and pH=6. The oxygen had a great influence on NO removal, but the influence could be reduced when 0.02 mol·L^-1 ascorbic acid was added. FT-IR analysis displayed that[Fe(Ⅱ)EDTA]^2- and SO₄^2- were both involved in ion exchange process, and BET analysis showed that the pore structure of D201 resins had not changed after ion exchange,and the large pore structure of resin remarkably increased the contact area of absorption reaction.